Make unit tests run in a Docker container

[dcrankshaw]

This adds a Docker container that can run all of our unit tests. In order to make this work, I also had to switch the base image for the query and management frontends from alpine to ubuntu. Other than increasing image size, this should not be a noticeable change.

[dcrankshaw]

You can run the unit tests with the following command:

docker run -it --rm --network=host -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp clipper/unittests:develop

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[dcrankshaw]

jenkins test this please

[dcrankshaw]

jenkins test this please

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[Corey-Zumar]

LGTM.

[Corey-Zumar]

From an ease of development standpoint, this change of base image is a plus. Any concerns about the difference in image size and overhead?

[dcrankshaw]

Not at this point. We can always build a minimal size docker image on alpine in the future. But that doesn't seem super important right now.

[Corey-Zumar]

Imo there shouldn't really be any since this is a base file used for frontend containers that we won't be replicating as frequently as model containers. Merging...